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Q: Fachverband Quantenoptik und Photonik

Q 60: Quantum Information II

Q 60.8: Poster

Donnerstag, 17. März 2022, 16:30–18:30, P

Quantum teleportation with only a single photon as a resource — •Lukas Hartung, Stefan Langenfeld, Stephan Welte, Severin Daiss, Philip Thomas, Olivier Morin, Emanuele Distante, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching

We report on the teleportation of a single qubit between two distant rubidium atoms each trapped at the center of a cavity in the strong-coupling regime connected by a 60m long glass fiber.

The teleportation of a quantum state allows for the deterministic transmission of qubits over lossy channels. In the common implementation of teleportation experiments, the sender and the receiver have to share a pair of entangled qubits to then transmit the source qubit to the receiver. The novel approach of our teleportation protocol is that a preshared entangled qubit pair is not required. The only necessary resource is a single photon which is first reflected off the receiver’s cavity and afterwards off the cavity of the sender and subsequently detected. The detection of the photon combined with feedback on the receiver’s atom heralds the succesful teleportation. This protocol allows for, in principle, unconditional teleportation. We teleport six mutually unbiased qubit states with an average fidelity F=(88.3 ± 1.3)% at a rate of 6Hz over 60m [1].

[1] Langenfeld et al., Phys. Rev. Lett. 126, 130502 (2021)